Drill



i. C. STOKES.

DRILL.

PPLICATION FILED nc.2o, m19.

Patented Nov. 30, 1920,

2 SHEETS-SHEET 2.

. cll-n'x :h5-15211155.

514mm, tot

UNITED STATESy .PATE-IN1"OFFI'.`

JOHN U. STOKES, OF SHREVEPORT, LOUISIANA.

DRILL.

Application med December To all whom t may conceive.: p

Be it known that I, JoHN (l. b'roxns, e

citizen of the United States, residing at Shreveport, in the county ofCaddo and Stute of Louisiana., have invented certain new and usefulImprovements in Drills, of which the following is :i specification.

This invention relates to Well digging apparatus, and the primari7object of the invention is to provide an improved drill having ineensfor chaniefiimr the drill bits in o deep well, without necessitating thewitle drewel of the drill stem or pipe from the hole.

Another object of the invention is the rovision of an improved means forexpan ing the drill` bits, after the sinne have reached :i predeterminedposition in relation to the drill stein lor pipe, and for holding; thebits in their extended posilions against ac cidental displacement.

A further object of the invention is to rovide on improved means forconnecting the drill hit to the drill holder, so that the drill holderwill engage the-hit in such e manner that the weight thereof will effcctively hold the bit in extended position and brace the .same so as toprevent breek ege thereof when the same strikes a rock or boulder.

further object of the invention is to provide u sectional bit. whichwhen in its extended position will be identical in form with the usualsolid fish tail bit now in vogue, which has 'been found to give the bestresults .in deep well boring.

A still further object of the invention is to provide an improved bitholder havingr means formed therein for effectively waslr inp; thecurved terminals of the bit sections, so :is to remove the debris fromaround the sinne during` the drilling operation.

still further object of the invention is to improve thc construction ofthe tool holder or bushing,F so as to effectively bruce the bit sectionswhen the salme are in their extended positions, so as to prevent thebreaking of the bits when the tool-is in operation.

A still further object of the invention is to provide an improved deviceoi the above character which is of exceedingly simple and durableconstruction. one which will be easy to monufnelure, and one which conspecicefion of Letters Patent.

. rier.

Patented Nov. 30; 1921 20, 1919. arial N0. 346,273.

be placed upon the market at a reasonable cost.

Other objects of the invention will iil'ppearl -through the improveddrill apparatus.

Fig. 2 is an enlarged fragmentary section shoiving the drill bit holderin its raised position, and the bits in their collapsed relation.

Fig. 3 is an enlarged vertical longitudinal section teken at rightangles to Fig. 1, and showing the bit holder and bits in their raisedposition.

Fig. 4 is a detail transverse section taken on the line 4-4 of Fig. 1.

Fig. 5 is e detail transverse section taken on the line 5--5 of Fig. 3.

Fig. 6 is a detail vertical longitudinal section taken on the line 6-6of Fig. 1.

Fig. is a detail transverse vsection through the tool holder or bushing'taken on the line 7-7 of Fig. 3. and

Fig. 8 is a bottom plan view of the tool holder or bushing, showing thebits in their extended operative positions.

Referring to the drawings, in detail, wherein similar referencecharacters designele corresponding parts throughout the several views,the letter A indicates the improved device which includes the stem B,the tool holder C. the bit carrier D, the bit E and the hoisting cable Ffor the bit car- The stem B is made up of the usual pipe sections 10 ofthe desired diameter connected together in the usual manner. Theuppermost pipe section 10 has rotatably connected thereto the cop 11 bythe usual or any preferred couplingrl, and the cap is provided with ahenger 13 and hose 14. Any standard rig i' not hose connection andferrule can be used with the improved drill. The lowerrnost pipe section10 has threadably connected thereto the bushing or tool holder C.

The bushing or tool holder C includes a tubulnr'lmdy l5 having its upperend pro vided with internal threads 16. for thc reception of the lowerthreaded end of the loivernnist pipe section l0 as heretofore stated,and the body 15 directly below the shown), cap. hunger,

shoulders 20. If the blades 26` do not drop at once into their places,they will remain against the walls 18 until they are lowered to thebottom of the well and the tool holder begins to revolve, and whenanything strikes the bit it will have a tendency to hold the same, andthe saine remains stationary until the toolholder touches them, at whichtime the weight of the tool holder C and bit carrier D will force theblades 26 into the slots 19 and against the shoulders Q0. When the wholetool is revolving', the bits A will have a tendency to brace one anotherin the center of the tool holder. The drilling is done in the usualmanner, and the water or mud und water that has come down the drillstem, to remove the debris from the bottom of the well passes from thepump through the hose 14, `throu l1 the perforated cable holder ell]which Wi l be hereinafter more fully described down the drill stem Bthrough the openings 35 and36 to the bottom of the well and up theoutside of the drill stem ll to the surface of the ground i When it isdesired to remore the drill hit E from the stem the same is raised inthe manner heretofore described, and the can reu moved, after which thecable l+` is puller upwardly which 'forces the bolt 33 to the upper endsof the slots thus collapsing the blades 26 of the bill E and thuspermitting the same to be easily pulled out o the stem.

The perforated cable holder 4-0 is of disk shape and is provided with uslot 41 to hold the cable F in position when the last cable section isplaced in position. The upper ter minal of the last cable section isprovided with the coupling` 42 which prevents the u i per end of thecable from slipping out of t .e slot 41, This plate or cable holder 40can he placed in any joint of the drill stem B. It is so constructedthat the same will fit the end o'l` a section of the drill pipe B, andat the same time allow the section to he Fitted into the coupling orpipe cap.

From the foregoing description 1t can be seen that an improved drill isprovided of exceptionally durable and simple construction, which willpermit the drill bit to be changed, Without necessitating the removal ofthe entire drill stem.

Changes in details may be made without departing from the spirit. orscope of my 1n vention; but,'

I claim:

1. A drill comprising a tool holder, a sectional bit, and means slidablyand pivotally carrying the bits arranged to open and close the seme inrelation to each other.

2. A drill comprising a stem, a tool holder carried by the stern, a bitcarrier, a support on the carrier, a bit including a. pair of sectionsslidably and pvotally mounted on said support,

A drill comprising a stem, a tool holder carried by the lower end of thean inwardly` extending annular shoulder 5. A drill comprising a stem, atool holder A carried by the stem, a bit carrier including a heavy bodyand a pair of dependin spaced legs, n holt carried by the legs andextending transversely across the same, a pair of bit blades slidablyand pivotall mounted on said holt, and outwardly exten ing shouldersformed on the upper terminals of the bit blades, arranged to engage thetool holder when the same reaches a. predetermiued osition.

6. A drill comprising a stem, a tool-holder carried by the stern, a bitcarrier arranged in the holder, a pair of bit blades having slots formedtherein below the transverse axes thereof mounted in said holder, and aholt carried bythe bit narrier fitted in said slots arranged to slidablyand pivotally support said blades.

7. ln a' drill, a drill carrier, a pair of relatively long bit bladeshavin slots formed therein arranged entirely belw the transverseexesthereof, and a bolt carried by the carrier positioned in said slotsarranged to slidably and pivotally support said blades.

8. A drill comprising e stem, a tool holder, a bit carrier slidablymounted in the stem and holder* indluding a solid body, and a pair ofdepending spaced le bit blades slidably and pivotally carrie by the legsoffthe carrier, the legs of the carrier having longitudinally extendingbores therethrough terminating adjacent to the lower ends of the bitblades.

9. A drill comprising a stem, a tool holder stem having formed therein,a bit carrier slidably mounted in the stem and holder, the inner face ofthe holder below the shoulder being provided with an outwardly flaredface, bit blades pivotally and slidably carried by the carrier, yandhaving outwardly rejecting extensions formed on their outer edgesadjacent to their upper ends arranged to engage the shoulder, the bladeshaving inwardly extending inclined notches formed therein opposite tosaid projecting portions arranged to engage the shoulder.

10. A drill comprising a stem, a tool holder carried by the stem, a bitcarrier slidably mounted in the stem and tool holder,

said tool holder having an internal annular `of the bits arranged toengage the shoulder of 4the tool holder to prevent downward movementthereof, the outer edges of the blades being arranged to enga e in the10 grooves and lon itu( inallyexten ing shoulders when the b ades reachtheir lowermost positions.

J OHN C. STOKES.

